Missing the plug for hole.
I tried filling it with water first & it was definitely NOT heavy enough & my 9ft umbrella tipped with the slightest breeze. I was SO ANGRY. I filled with sand then added water & it is much heavier. This really is supposed to be used with a table- not a stand alone- as the neck is very short. Do I wish I would of spent a little more $$ & gotten the heavier/longer neck stand? YES. Will I make this one work? YES. I DO like that it's resin & white so it doesn't get boiling hot in the sun.